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WO2000005830A1 - Systeme de communication mobile et procede de communication mobile - Google Patents

Systeme de communication mobile et procede de communication mobile Download PDF

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Publication number
WO2000005830A1
WO2000005830A1 PCT/JP1998/003278 JP9803278W WO0005830A1 WO 2000005830 A1 WO2000005830 A1 WO 2000005830A1 JP 9803278 W JP9803278 W JP 9803278W WO 0005830 A1 WO0005830 A1 WO 0005830A1
Authority
WO
WIPO (PCT)
Prior art keywords
communication system
wireless communication
procedure
electromagnetic wave
base station
Prior art date
Application number
PCT/JP1998/003278
Other languages
English (en)
Japanese (ja)
Inventor
Hitoshi Kosaki
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to US09/319,177 priority Critical patent/US6473627B1/en
Priority to JP54233899A priority patent/JP3671377B2/ja
Priority to PCT/JP1998/003278 priority patent/WO2000005830A1/fr
Priority to CN98809413.4A priority patent/CN1271482A/zh
Priority to DE69827832T priority patent/DE69827832T2/de
Priority to EP98933893A priority patent/EP1022868B1/fr
Publication of WO2000005830A1 publication Critical patent/WO2000005830A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the present invention relates to a mobile communication system and a mobile communication method capable of shortening “time when service cannot be performed” which occurs when a communication terminal performs system switching in a communication terminal that can use a plurality of wireless communication systems. Things. Background art
  • the initial sequence consists of (1) tracking of steps 20 to 22 (when using an antenna with directivity ffl), and (2) steps of steps 23 to 24. Frequency correction, (3) Steps 25 to 27 are largely divided into evaluations of wireless circuits.
  • FIG. 12 each example will be described with specific examples.
  • 11 is a diagram showing a configuration of a conventional mobile communication terminal.
  • 1 is an antenna that transmits and receives electromagnetic waves
  • 2 is a tracking device that directs the directional direction of the antenna 1 toward the arrival direction of the electromagnetic waves
  • 3 is a receiver that demodulates the received electromagnetic waves
  • 4 is an electromagnetic wave that is to be transmitted.
  • 5 is a handset for displaying to the user and receiving instructions from the user
  • 6 is a controller for controlling the above-mentioned tracking device 2 to the handset 5
  • 100 is a communication terminal. It is.
  • W is an antenna that transmits and receives electromagnetic waves
  • 2 is a tracking device that directs the directional direction of the antenna 1 toward the arrival direction of the electromagnetic waves
  • 3 is a receiver that demodulates the received electromagnetic waves
  • 4 is an electromagnetic wave that is to be transmitted.
  • 5 is a handset for displaying to the user and receiving instructions from the user
  • 6 is a controller for controlling the above-mentioned tracking device 2 to the handset 5
  • 100
  • 61 is a system switching function unit
  • 62 is a control function unit for system 1
  • 63 is a control function unit for system 2.
  • a conventional communication terminal operates as follows. When the communication terminal 100 is turned on, first, the controller 6 receives the initial acquisition frequency input by the user from the handset 5 (or stored in the controller 6) by the receiver. Instruct “3” to perform “broadband acquisition operation instructions” for electromagnetic waves with a relatively wide reception band (these instructions are referred to as reception control signals in the figure). Further, the controller 6 also instructs the tracking device 2 to “search” for the arrival direction of the electromagnetic wave.
  • the tracking device 2 Upon receiving this instruction, the tracking device 2 sequentially monitors the reception status signals (signals indicating the reception status such as the reception level and the bit error rate) obtained from the receiver 3 while changing the directivity of the antenna 1. Thus, the direction of the antenna 1 is controlled so as to direct the electromagnetic wave in a good direction. Further, the tracking device 2 notifies the controller 6 of "search completion" after turning the antenna 1 in the direction of good reception status. After that, the tracking device 2 controls the antenna so as to maintain a good direction of the electromagnetic wave condition. Next, when the tracking device 2 is notified of “completion of the search” from the tracking device 2, the controller 6 transmits a reception control signal called “frequency correction” to the receiver 3 to perform the same initial capture.
  • the reception status signals signals indicating the reception status such as the reception level and the bit error rate
  • the controller 6 checks the completion of the correction, and confirms that the correction can be sufficiently performed by the reception state signal obtained from the receiver 3. Finally, the controller 6 receives the input from the user through the handset 5 (or the controller
  • Step 6 evaluates the state of the line based on the reception status signal obtained at this time, confirms that sufficient reception is possible, and then allows the user to communicate.
  • the communication terminal in the conventional mobile communication system described above uses the same artificial satellite when the user attempts to switch the system. As described above, there was a problem that the satellites would be captured. In addition, since the same artificial satellite is used, the base station uses the same reference frequency, and the frequency deviation is the same, the above frequency correction is performed despite the fact that the frequency correction can be the same. There was a problem that would. Furthermore, since the same artificial satellite is used and the base station is the same, the above-mentioned radio link is evaluated despite the fact that it is likely to have almost the same radio link quality. There was a problem.
  • the conventional communication terminal described above has a problem that a time period during which communication service cannot be performed for about 20 seconds occurs.
  • the present invention has been made in order to solve the above-described problems, and it is intended that a communication terminal greatly shortens an initial sequence by utilizing a similar electromagnetic wave environment between systems to be switched. It is an object of the present invention to obtain a mobile communication system and a mobile communication method that can perform the communication. That is, in recent years, many wireless communication systems have been proposed and commercial services have begun. Conventionally, communication terminals have been prepared for each of these communication systems, but there is a growing demand for using multiple systems with one communication terminal.
  • the present invention relates to a communication terminal that can use such a plurality of systems. The aim is to obtain a communication terminal that allows users to receive services quickly by shortening the time required for. Disclosure of the invention
  • the mobile communication system comprises: a radio base station that transmits and receives an electromagnetic wave of a first wireless communication system and an electromagnetic wave of a second wireless communication system; an electromagnetic wave of the first wireless communication system; An antenna that transmits and receives electromagnetic waves of the second wireless communication system, a tracking device that directs the directional direction of the antenna toward the arrival direction of the electromagnetic waves, the received electromagnetic waves of the first wireless communication system, and a second wireless device A receiver for demodulating the electromagnetic waves of the communication system, a transmitter for modulating the contents to be transmitted to the electromagnetic waves of the first wireless communication system and the electromagnetic waves of the second wireless communication system, and displaying predetermined information to the outside.
  • a predetermined condition is satisfied, in which a communication terminal having a controller to implement the initial acquisition procedure in which a predetermined procedure is omitted.
  • the controller of the communication terminal may be configured so that the arrival direction of the electromagnetic wave of the first wireless communication system is the same as the arrival direction of the electromagnetic wave of the second wireless communication system. After the wireless communication system is switched, an initial acquisition procedure in which the tracking procedure is omitted is performed.
  • the controller of the communication terminal when the controller of the communication terminal is configured such that a reference clock of the first wireless communication system is synchronized with a reference clock of the second wireless communication system, After the switching of the wireless communication system, an initial acquisition procedure in which the frequency correction procedure is omitted is performed. Further, in the mobile communication system according to the present invention, when the controller of the communication terminal is the same as the base station of the first wireless communication system and the base station of the second wireless communication system, the wireless communication system is switched. After that, execute the initial acquisition procedure with the line evaluation procedure omitted. What to do.
  • the controller of the communication terminal may further include: a reference clock of the first wireless communication system is synchronized with a reference clock of the second wireless communication system. After the wireless communication system is switched, an initial acquisition procedure in which the tracking procedure and the frequency correction procedure are omitted is performed. Further, in the mobile communication system according to the present invention, the controller of the communication terminal may further include: a base station of the first wireless communication system and a base station of the second wireless communication system, After the communication system is switched, the initial acquisition procedure in which the frequency correction procedure and the line evaluation procedure are omitted is performed.
  • the controller of the communication terminal may further include an arrival direction of the electromagnetic wave of the first wireless communication system and an arrival direction of the electromagnetic wave of the second wireless communication system.
  • the initial acquisition procedure in which the line evaluation procedure and the tracking procedure are omitted is performed.
  • the mobile communication system according to the present invention may further include: a controller of the communication terminal; and a base station of the first wireless communication system and a base station of the second wireless communication system. After the communication system is switched, the initial acquisition procedure is omitted, in which the tracking procedure, frequency correction procedure, and line evaluation procedure are omitted.
  • the mobile communication system according to the present invention further includes: a communication satellite that relays electromagnetic waves of the first wireless communication system and the electromagnetic waves of the second wireless communication system between the wireless base station and the communication terminal. It is provided with. Further, in the mobile communication system according to the present invention, the controller of the communication terminal is configured such that the first reference clock of the first wireless communication system and the second reference clock of the second wireless communication system are pseudo. When the wireless communication system is switched, This is to execute an initial acquisition procedure in which the wave number correction procedure is omitted.
  • a mobile communication system according to the present invention includes: a first wireless base station that transmits and receives electromagnetic waves of a first wireless communication system having a first reference clock; and a second wireless base station that is pseudo-synchronized with the first reference clock.
  • a second wireless base station that transmits and receives electromagnetic waves of a second wireless communication system having a reference clock of: and an antenna that transmits and receives electromagnetic waves of the first wireless communication system and an electromagnetic wave of the second wireless communication system,
  • a tracking device for directing the directional direction of the antenna toward the arrival direction of the electromagnetic wave;
  • a receiver for demodulating the received electromagnetic wave of the first wireless communication system and the electromagnetic wave of the second wireless communication system;
  • a controller for performing the initial acquisition procedure in which the frequency correction procedure is omitted when controlling each of the devices and switching from the first wireless communication system to the second wireless communication system.
  • the mobile communication system further includes: a first communication satellite that relays an electromagnetic wave of the first wireless communication system between the first wireless base station and the communication terminal; And a second communication satellite that relays electromagnetic waves of the second wireless communication system between the second wireless base station and the communication terminal.
  • a mobile communication method according to the present invention is a communication base station having a first wireless communication system and a second wireless communication system, and a communication sharing the first wireless communication system and the second wireless communication system. In a mobile communication system that performs wireless communication with a terminal, when switching from the first wireless communication system to the second wireless communication system, a predetermined condition is satisfied. Then, an initial acquisition procedure in which a predetermined procedure is omitted is performed.
  • the communication terminal may further comprise: When the arrival direction of the electromagnetic wave of the communication system is the same as the arrival direction of the electromagnetic wave of the second wireless communication system, after the wireless communication system is switched, an initial acquisition procedure in which the tracking procedure is omitted is performed. Further, the mobile communication method according to the present invention is characterized in that, when the communication terminal synchronizes a reference clock of the first wireless communication system with a reference clock of the second wireless communication system, After the switching, the initial capture procedure in which the frequency correction procedure is omitted is performed.
  • FIG. 1 is a block diagram showing a configuration of a communication terminal of a mobile communication system according to Embodiment 1 of the present invention.
  • FIG. 2 is a diagram showing a configuration of a mobile communication system according to Embodiment 1 of the present invention.
  • FIG. 3 is a flowchart showing an operation of a communication terminal of the mobile communication system according to Embodiment 1 of the present invention.
  • FIG. 4 is a flowchart showing the operation of the communication terminal of the mobile communication system according to the second embodiment of the present invention.
  • FIG. 5 is a flowchart showing the operation of the communication terminal of the mobile communication system according to Embodiment 3 of the present invention.
  • FIG. 6 is a flowchart showing the operation of the communication terminal of the mobile communication system according to Embodiment 4 of the present invention.
  • FIG. 7 is a diagram showing a configuration of a mobile communication system according to Embodiment 5 of the present invention
  • FIG. 8 is a diagram showing a configuration of a mobile communication system according to Embodiment 6 of the present invention
  • FIG. 9 is an embodiment of the present invention.
  • FIG. 10 is a diagram showing a configuration of a mobile communication system according to Embodiment 8 of the present invention
  • FIG. 11 is a block diagram showing a configuration of a communication terminal of a conventional mobile communication system
  • FIG. 4 is a flowchart illustrating an operation of a communication terminal of the communication system.
  • FIG. 1 is a block diagram showing a configuration of a communication terminal of a mobile communication system according to Embodiment 1 of the present invention.
  • 1 is an antenna that transmits and receives electromagnetic waves (radio waves)
  • 2 is a tracking device that directs the direction of antenna 1 to the arrival direction of electromagnetic waves
  • 3 is a receiver that demodulates received electromagnetic waves
  • 4 is a transmitter that wants to transmit.
  • a transmitter that modulates the contents into electromagnetic waves is a handset that displays to the user and receives instructions from the user, 6 A is a controller that controls the above tracking device 2 to the handset 5, and 100 A is It is a communication terminal.
  • This controller 6A includes a conventional system switching function unit 61, a control function unit 62 for Sys-1 and a control function unit 63 for Sys-2 as shown in FIG. There are a system switching function unit 61A, a control function unit 62A for system 1, and a control function unit 63A for system 2, respectively, which cooperate to omit the tracking procedure. In this example, two systems can be used for simplicity.
  • FIG. 2 is a diagram showing an example of a first embodiment of the present invention, in which a plurality of systems are implemented by one communication terminal.
  • a communication terminal 10 OA is mounted on a mobile body, and performs circuit-switched communication or packet-switched communication as required by a user.
  • the base station 200 has a circuit-switched communication system and a bucket-switched communication system.
  • the direction of arrival of radio waves is the same between the circuit-switched communication system and the packet-switched communication system.
  • the communication terminal 100 OA is provided with an antenna 1 having high directivity.
  • the direction of the antenna 1 is transmitted to the tracking device 2. More control.
  • a circuit-switched communication system and a bucket-switched communication system are described as examples of multiple systems, but the same applies to other systems, and the number of systems is not limited to two.
  • FIG. 3 is a flowchart illustrating the operation of the communication terminal according to the first embodiment.
  • Figure 3 shows the details of the procedures for the system switching function unit 61A, the control function unit 62A for system 1, and the control function unit 63A for system 2.
  • a power ON instruction is sent from the handset 5 to the system (System) switching function unit 61 A.
  • the system switching function section 61A defines the system to be used in the same way as the conventional equipment, and the control function section 62A or 63A on the system side to be used is not omitted as in the conventional equipment. Instruct the initial acquisition procedure to be performed. As a result, the communication terminal 10 OA performs the same initial acquisition procedure as the conventional device.
  • a system switching instruction is sent from the handset 5 to the system switching function unit 61A.
  • the system switching function unit 61 A switches on the power of the currently used system.
  • the tracking procedure can be omitted.
  • FIG. 2 illustrates the case where the reference clock of the circuit-switched communication system and the reference clock of the bucket-switched communication system are the same
  • the control function section 62A or 63A skips the tracking procedure (steps 20 to 22) and jumps to step 23 according to the above instruction.
  • the control function section 62A or 63A performs frequency correction of the receiver 3 (steps 23 to 24) and evaluation of the line (steps 25 to 27). Do it once.
  • control function unit 62A or 63A reaches the normal reception state, and the user can communicate, and the initial acquisition procedure in which the tracking procedure is omitted is performed.
  • the control function unit 62A or 63A determines whether the frequency correction result of FIG. 3 is not good (No), that is, By proceeding to step 20 and performing the tracking procedure (steps 20 to 22), it is possible to cope with large fluctuations as before.
  • the branch for performing the above tracking procedure (steps 20 to 22) is also used in the evaluation of the line condition (steps 25 to 27), where the next candidate frequency to be set when it is not good is set as follows. It may be inserted so that it is performed only once in several times. Example 2.
  • FIG. 4 is a flowchart showing the operation of the communication terminal according to Embodiment 2 of the present invention.
  • the second embodiment is an example in which the reference clock of each system before and after switching is the same, that is, synchronized, so that frequency correction can be omitted and switching time can be reduced.
  • the hardware configurations of the mobile communication system and the communication terminal 100B are the same as those in FIGS. 1 and 2 of the first embodiment.
  • the base station 200 has a circuit-switched communication system and a packet-switched communication system, and the reference clock of each system must be the same.
  • FIG. 4 shows the details of the procedure of the system switching function unit 61B, the control function unit 62B for the system 1, and the control function unit 63B for the system 2 of the second embodiment.
  • the system switching instruction is sent from the handset 5 to the system switching function unit 61B.
  • the system switching function unit 6 1B determines whether the line condition of the electromagnetic wave of the currently used system is good, and if so, the control function unit 6 of the system to be newly used. Instruct 2B or 63B to perform the omitted initial acquisition procedure.
  • the reference clocks of the two systems before and after the switch are the same, if the line state of the system before the switch is good, it can be estimated that the line state of the system after the switch is good, and the system after the switch The frequency correction procedure can be omitted. You. Although FIG.
  • the control function unit 62B or 63B stores that the frequency correction procedure is omitted in step 41 according to the above instruction.
  • the control function section 62B or 63B performs the tracking procedure (steps 20 to 22).
  • the control function section 62B or 63B stores in step 42 that the frequency correction procedure is omitted, the frequency correction procedure (steps 23 to 24) is omitted, and the circuit is evaluated. (Steps 25 to 27).
  • the control function section 62B or 63B reaches the normal reception state, and the user can communicate.
  • the branch for performing the above-described frequency correction procedure (steps 23 to 24) is set after setting the next candidate frequency (step 27) to be performed when the frequency is not good. , May be inserted. That is, the process returns to step 23 without returning to step 25. If the evaluation of the line condition (Steps 25 to 27) is not good, the procedure is repeated to execute the tracking procedure (Steps 20 to 22), and then to the frequency correction procedure (Steps 23 to 24). You may. That is, the process returns from step 26 to step 20.
  • FIG. 5 is a flowchart showing the operation of the communication terminal according to Embodiment 3 of the present invention.
  • the base station of each system before and after the switching is the same, In this example, line evaluation can be omitted and switching time can be shortened because the possibility of line quality is high.
  • the hardware configurations of the mobile communication system and the communication terminal 100C are the same as those in FIGS. 1 and 2 of the first embodiment.
  • FIG. 5 shows the details of the procedure of the system switching function unit 61 C, the control function unit 62 C for the system 1, and the control function unit 63 C for the system 2 of the third embodiment.
  • step 50 the system switching function unit 6 1C determines whether the line condition of the electromagnetic wave of the currently used system is good, and if it is good, the control function unit 6 2 of the newly used system side C, or 6 3. Instructs it to perform the omitted initial acquisition procedure. In other words, since the base stations of the two systems before and after the switch are the same, if the line state of the system before the switch is good, it can be estimated that the line state of the system after the switch is good, and the system after the switch The evaluation procedure can be omitted.
  • FIG. 2 illustrates a case in which the antenna equipment of the circuit-switched communication system and the antenna system of the bucket-switched communication system are shared and the arrival direction of the radio wave is the same, the tracking procedure is not omitted in the third embodiment. Therefore, the arrival direction of the radio wave may be different.
  • FIG. 2 illustrates a case where the reference clocks of the above two systems are the same. However, in the third embodiment, since the frequency correction procedure is not omitted, the reference clocks may be shifted.
  • the control function section 6 2 C or 6 3 C responds to the And omit the line evaluation procedure.
  • the control function section 62C or 63C performs a tracking procedure (steps 20-22) and a frequency correction procedure (steps 23-24).
  • control function unit 62C or 63C stores in step 52 that the line evaluation procedure is omitted, it skips the line evaluation and reaches the normal reception state. Thus, user communication becomes possible.
  • the control function unit 62C or 63C determines in step 53 the reception level, C / N, or the simplified line quality using the reception synchronization signal. Processing.
  • the branch for performing the normal line evaluation (steps 25 to 27) is performed when the judgment is not good in the simplified line quality processing using the received synchronization signal etc. instead of the above. .
  • the memory for omitting the line evaluation procedure in step 54 is cleared, and the process returns to step 25.
  • FIG. 6 is a flowchart showing the operation of the communication terminal according to Embodiment 4 of the present invention.
  • the initial acquisition procedure in which any one of the two procedures is omitted may be used.
  • FIG. 6 shows the details of the procedure of the system switching function unit 61D, the control function unit 62D for the system 1, and the control function unit 63D for the system 2 of the fourth embodiment.
  • FIG. 6 shows an example in which all three types of processing are omitted, omitting only arbitrary two types of processing means that only the branch corresponding to the one not omitted in FIG. Can be easily realized.
  • Embodiment 5 A mobile communication system according to Embodiment 5 of the present invention will be described with reference to the drawings.
  • FIG. 7 is a diagram showing a configuration of a mobile communication system according to Embodiment 5 of the present invention.
  • the communication terminals 100A to 100D directly transmit and receive electromagnetic waves to and from the base station 200.
  • the fifth embodiment as shown in FIG.
  • the communication terminals 100A to 100D transmit and receive electromagnetic waves by relaying electromagnetic waves from the base station 20OA once by a communication satellite 300.
  • Other configurations and detailed procedures are the same as those in Examples 1 to 4, respectively.
  • Embodiment 6 A mobile communication system according to Embodiment 6 of the present invention will be described with reference to the drawings.
  • FIG. 8 is a diagram showing a configuration of a mobile communication system according to Embodiment 6 of the present invention.
  • each system uses the same reference clock in the base station 200.
  • FIG. 9 is a diagram showing a configuration of a mobile communication system according to Embodiment 7 of the present invention.
  • each system uses the same reference clock in one base station 200.
  • each system uses an independent reference clock. This is an example in which two base stations 200 C and 200 D are used.
  • FIG. 10 is a diagram showing a configuration of a mobile communication system according to Embodiment 8 of the present invention.
  • the communication terminal 100 B transmits and receives electromagnetic waves directly to and from the base stations 200 C and 200 D.
  • Communication terminal 100B transmits and receives electromagnetic waves to and from base stations 200E and 200F via different communication satellites 300A and 300B.
  • some systems are via communication satellites.
  • the reference clock of each system is high-accuracy, the frequency fluctuation of each base station and communication satellite can be ignored, and the relative moving speed of the communication terminal from the base station is small enough to ignore the frequency shift due to Doppler shift.
  • the system switching function units 61 A to 61 D are provided with a function of determining whether the electromagnetic wave line state of the currently used system is good.
  • the control function section 62A to 62D or 63A to 63D may be inserted.
  • the control function unit for system 1, and the control function unit for system 2 the whole may be realized as one function, and how each function shown in each detailed procedure is described. May be shared.
  • the present invention provides a communication terminal capable of using a plurality of wireless communication systems, by shortening the time required for system switching, thereby improving the wireless communication system on the side where the user has requested switching. Be available quickly. Therefore, not only does the user not feel the burden of switching between multiple wireless communication systems, but also the mobile communication system switches the wireless communication system for the user so that there is an automatic switching function between the wireless communication systems. It is also possible to configure a communication terminal that hardly makes any sense. Industrial applicability
  • the mobile communication system includes: a radio base station that transmits and receives an electromagnetic wave of the first wireless communication system and an electromagnetic wave of the second wireless communication system; and an electromagnetic wave of the first wireless communication system.
  • the electromagnetic of the second wireless communication system An antenna for transmitting and receiving a wave; a tracking device for directing the direction of the antenna toward the arrival direction of the electromagnetic wave; a receiver for demodulating the received electromagnetic wave of the first wireless communication system and the electromagnetic wave of the second wireless communication system; A transmitter for modulating the content to be performed on the electromagnetic wave of the first wireless communication system and the electromagnetic wave of the second wireless communication system, a handset for displaying predetermined information to the outside and receiving an instruction from the outside, and
  • an initial acquisition procedure in which a predetermined procedure is omitted is performed.
  • the controller of the communication terminal is configured to control the arrival direction of the electromagnetic wave of the first wireless communication system and the arrival direction of the electromagnetic wave of the second wireless communication system.
  • the controller of the communication terminal sets the reference clock of the first wireless communication system and the reference clock of the second wireless communication system in synchronization.
  • the controller of the communication terminal when the controller of the communication terminal is the same as the base station of the first wireless communication system and the base station of the second wireless communication system, Furthermore, since the initial acquisition procedure in which the line evaluation procedure is omitted after the switching of the wireless communication system is performed, the time required for switching the wireless communication system can be shortened. Further, in the mobile communication system according to the present invention, as described above, the controller of the communication terminal further comprises: a reference clock of the first wireless communication system and a reference clock of the second wireless communication system are synchronized.
  • the controller of the communication terminal further includes a base station of the first wireless communication system and a base station of the second wireless communication system. In the same case, after the wireless communication system is switched, the initial acquisition procedure in which the frequency correction procedure and the line evaluation procedure are omitted is performed, so that the time required for switching the wireless communication system can be shortened.
  • the controller of the communication terminal further includes: an arrival direction of the electromagnetic wave of the first wireless communication system and an electromagnetic wave of the second wireless communication system. If the directions of arrival are the same, after the wireless communication system is switched, the initial acquisition procedure in which the line evaluation procedure and the tracking procedure are omitted is performed, so that the time required for switching the wireless communication system can be shortened.
  • the controller of the communication terminal further includes a base station of the first wireless communication system and a base station of the second wireless communication system.
  • the initial acquisition procedure in which the tracking procedure, the frequency correction procedure, and the line evaluation procedure are omitted is performed, so that the time required for switching the wireless communication system can be shortened.
  • the mobile communication system according to the present invention further includes: an electromagnetic wave of the first wireless communication system between the wireless base station and the communication terminal;
  • the communication satellite for relaying the electromagnetic waves of the second wireless communication system since the communication satellite for relaying the electromagnetic waves of the second wireless communication system is provided, it is possible to reduce the time required for switching the wireless communication system.
  • the controller of the communication terminal includes a first reference clock of the first wireless communication system and a second reference clock of the second wireless communication system. When the reference clocks are pseudo-synchronized, the initial acquisition procedure without the frequency correction procedure is performed after the wireless communication system is switched, so that the time required for switching the wireless communication system can be reduced. Play
  • the mobile communication system includes: a first wireless base station that transmits and receives electromagnetic waves of a first wireless communication system having a first reference clock; A second wireless base station that transmits and receives electromagnetic waves of a second wireless communication system having a second reference clock that is quasi-synchronous with the second wireless base station; an electromagnetic wave of the first wireless communication system; and a second wireless communication system.
  • An antenna for transmitting and receiving electromagnetic waves An antenna for transmitting and receiving electromagnetic waves, a tracking device for directing the directivity of the antenna to the arrival direction of the electromagnetic waves, a receiver for demodulating the received electromagnetic waves of the first wireless communication system and the electromagnetic waves of the second wireless communication system
  • a transmitter that modulates the contents to be transmitted to the electromagnetic waves of the first wireless communication system and the electromagnetic waves of the second wireless communication system displays predetermined information to the outside, and receives an external instruction.
  • Receiving the handset, and controlling each of the devices, and when switching from the first wireless communication system to the second wireless communication system performs an initial acquisition procedure in which a frequency correction procedure is omitted. Since the communication terminal having the controller is provided, the time required for switching the wireless communication system can be reduced.
  • the mobile communication system according to the present invention further includes a first communication device for relaying an electromagnetic wave of the first wireless communication system between the first wireless base station and the communication terminal.
  • a satellite, and a second communication satellite for relaying electromagnetic waves of the second wireless communication system between the second wireless base station and the communication terminal This has the effect of reducing the required time when switching wireless communication systems.
  • a mobile communication method includes a wireless base station having a first wireless communication system and a second wireless communication system, a first wireless communication system, and a second wireless communication system.
  • the communication terminal is configured to switch from the first wireless communication system to the second wireless communication system.
  • the initial acquisition procedure in which the predetermined procedure is omitted is performed, so that the time required for switching the wireless communication system can be shortened.
  • the communication terminal may be configured such that the arrival direction of the electromagnetic wave of the first wireless communication system and the arrival direction of the electromagnetic wave of the second wireless communication system are the same.
  • the mobile communication method according to the present invention is configured such that, when the communication terminal is synchronized with a reference clock of the first wireless communication system and a reference clock of the second wireless communication system. After the wireless communication system is switched, the initial acquisition procedure in which the frequency correction procedure is omitted is performed, so that the time required for switching the wireless communication system can be shortened.
  • the mobile communication method when the communication terminal is the same as the base station of the first wireless communication system and the base station of the second wireless communication system, After the wireless communication system is switched, the initial acquisition procedure in which the line evaluation procedure is omitted is performed, so that the time required for switching the wireless communication system can be shortened.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention se rapporte à un système de communication mobile comportant une station de base radio conçue pour émettre/recevoir une onde électromagnétique d'un système de communication radio à commutation de circuits et une onde électromagnétique d'un système de communication radio à commutation par paquets; une antenne conçue pour émettre/recevoir une onde électromagnétique du système de communication radio à commutation de circuits et une onde électromagnétique du système de communication radio à commutation par paquets; une unité de recherche conçue pour fixer la directivité de l'antenne dans la direction entrante de l'onde électromagnétique; un récepteur conçu pour démoduler l'onde électromagnétique reçue du système de communication radio à commutation de circuits et l'onde électromagnétique reçue du système de communication radio à commutation par paquets; un émetteur conçu pour moduler les signaux à émettre sous forme d'onde électromagnétique du système de communication radio à commutation de circuits et d'onde électromagnétique du système de communication radio à commutation par paquets; un combiné conçu pour indiquer des informations spécifiées à l'extérieur et recevoir une commande externe; et un terminal de communication comportant une unité de commande permettant de commander ces unités et d'exécuter une procédure initiale d'acquisition, avec omission d'une procédure de recherche ou analogue lorsque des conditions spécifiées sont satisfaites au moment de la commutation se produisant, par exemple, du système de communication radio à commutation de circuits au système de communication à commutation par paquets. Le délai requis pour la commutation des systèmes de communication radio peut ainsi être réduit.
PCT/JP1998/003278 1998-07-22 1998-07-22 Systeme de communication mobile et procede de communication mobile WO2000005830A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US09/319,177 US6473627B1 (en) 1998-07-22 1998-07-22 Mobile communication system and mobile communication method
JP54233899A JP3671377B2 (ja) 1998-07-22 1998-07-22 移動体通信システム及び移動体通信方法
PCT/JP1998/003278 WO2000005830A1 (fr) 1998-07-22 1998-07-22 Systeme de communication mobile et procede de communication mobile
CN98809413.4A CN1271482A (zh) 1998-07-22 1998-07-22 移动通信系统及移动通信方法
DE69827832T DE69827832T2 (de) 1998-07-22 1998-07-22 Mobile kommunikationsanordnung und mobiles kommunikationsverfahren
EP98933893A EP1022868B1 (fr) 1998-07-22 1998-07-22 Systeme de communication mobile et procede de communication mobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1998/003278 WO2000005830A1 (fr) 1998-07-22 1998-07-22 Systeme de communication mobile et procede de communication mobile

Publications (1)

Publication Number Publication Date
WO2000005830A1 true WO2000005830A1 (fr) 2000-02-03

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Country Status (6)

Country Link
US (1) US6473627B1 (fr)
EP (1) EP1022868B1 (fr)
JP (1) JP3671377B2 (fr)
CN (1) CN1271482A (fr)
DE (1) DE69827832T2 (fr)
WO (1) WO2000005830A1 (fr)

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WO2020011254A1 (fr) 2018-07-13 2020-01-16 正大天晴药业集团股份有限公司 Composé tri-cyclique condensé en tant que double inhibiteur de pde3/pde4
WO2021143841A1 (fr) 2020-01-15 2021-07-22 正大天晴药业集团股份有限公司 Composition pharmaceutique de composé inhibiteur double de pde3/pde4 tricyclique
WO2021143843A1 (fr) 2020-01-15 2021-07-22 正大天晴药业集团股份有限公司 Cristal d'inhibiteur double de pde3/pde4 et son utilisation

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WO2020011254A1 (fr) 2018-07-13 2020-01-16 正大天晴药业集团股份有限公司 Composé tri-cyclique condensé en tant que double inhibiteur de pde3/pde4
WO2021143841A1 (fr) 2020-01-15 2021-07-22 正大天晴药业集团股份有限公司 Composition pharmaceutique de composé inhibiteur double de pde3/pde4 tricyclique
WO2021143843A1 (fr) 2020-01-15 2021-07-22 正大天晴药业集团股份有限公司 Cristal d'inhibiteur double de pde3/pde4 et son utilisation

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US6473627B1 (en) 2002-10-29
EP1022868A4 (fr) 2001-05-09
JP3671377B2 (ja) 2005-07-13
DE69827832T2 (de) 2005-10-27
EP1022868A1 (fr) 2000-07-26
DE69827832D1 (de) 2004-12-30
EP1022868B1 (fr) 2004-11-24
CN1271482A (zh) 2000-10-25

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